Re: emacs 30.5.0 editing epub

[Yuri Khan <yuri.v.khan@gmail.com>]

On Thu, 16 Mar 2023 at 20:17, H.-J. Heitländer
<Heiner.Heitlaender@posteo.de> wrote:

> kill buffer up to the top epub
>
> reopen epub
>
> open epub subfile (...html)
>
> C-x RET r ... utf-8
>
> in minibufer: Revert buffer from file xxx.html? (y or n)
>
> Answer: y
>
> Minibuffer: Cannot revert noexistent file xxx.html

You keep mentioning “editing epub”. Are you even sure it’s supposed to work?

An EPUB file is a zip archive, typically containing XHTML pages and
some metadata. Emacs covers some basic scenarios where you can browse
the archive, visit files inside, even edit and save them (and they get
re-compressed and updated in the archive).

Reverting, on the other hand, does not work, probably because of the
way archive-mode is implemented. So when it picks the wrong encoding,
you cannot fix it by reverting.

You could probably achieve better results if you first extract the
contents of the EPUB archive into a real directory on your file
system, then edit files there. If necessary, re-pack the modified
files.

I see ‘archive--extract-file’ initially sets the coding system to
‘no-conversion’, possibly because it needs that for decompression. It
is supposed to re-decide on a coding system later in
‘archive-set-buffer-as-visiting-file’, but for some reason it keeps
‘no-conversion’ in your case.